File:The street railway review (1891) (14758762094).jpg

Identifier: streetrailwayrev11amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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s, the shocks of this nature are very considerable. Inactual practice the flappers are often wrenched off at these places. The author believes it to be indisputable that other forms ofplow are much more efficient, but none of them have the advantageof being able to be withdrawn from or lowered into the conduitwithout a special trap construction at a fixed point. In the light oi present experience the best plow is one havingsoft cast-iron shoes, pressed lightly against the vertical faces ofthe conductor bars by semi-elliptic springs horizontally placed.The shoes preferably should be carried by horizontal links, whichtake all the shocks to which they may be subjected, leaving thesprings free to do the work only of pressing the shoes outwardly.In this way the risk of deforming the springs is avoided. Thelinks should be constructed so as to limit the outward course ofthe shoes. The conductor bars at switches and crossings aresimply curved slightly outwardly. The shoes are connected to the
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the flapper. The springs make the flappers press against the con-ductor bars. The contact may be made on the vertical or theupper face of the bars according to the way the road is designed.The flappers are not thick, in fact, the whole construction of theplow is very much cramped, for it must pass through the i%-in.slot. The plow of this form is withdrawn easily, but it has to bespecially weighted to make it descend, for it has only its ownweight to overcome the tension of the flapper springs, so that theywill take the vertical position necessary to pass through the slot.There could be no good reason for not adopting one of theseplow designs for a side-slot conduit with ij^-- slot—for a centerslot, with J4-n- width, their use is out of the question—if no othergomplications were involved; but the plow is one of the most leads by copper fuses. This plow construction is simple; in actualresults it has proved itself to be efficient. It certainly is an im-provement upon the flapper typ

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